use format.json in UserRegistrationController#create

app/controllers/user_registrations_controller.rb

@@ -31,7 +31,7 @@ def create
     associate_user
 
     respond_to do |format|
-      format.js do
+      format.json do
         render json: { email: @user.email }
       end
     end
@@ -51,7 +51,7 @@ def spree_user_params
   def render_error(errors = {})
     clean_up_passwords(resource)
     respond_to do |format|
-      format.js do
+      format.json do
         render json: errors, status: :unauthorized
       end
     end

spec/controllers/user_registrations_controller_spec.rb

@@ -8,7 +8,7 @@
     @request.env["devise.mapping"] = Devise.mappings[:spree_user]
   end
 
-  describe "via ajax" do
+  describe "create" do
     render_views
 
     let(:user_params) do
@@ -20,7 +20,7 @@
     end
 
     it "returns validation errors" do
-      post :create, xhr: true, params: { spree_user: {}, use_route: :spree }
+      post :create, params: { spree_user: {}, use_route: :spree }, as: :json
       expect(response.status).to eq(401)
       json = JSON.parse(response.body)
       expect(json).to eq("email" => ["can't be blank"], "password" => ["can't be blank"])
@@ -30,7 +30,7 @@
       allow(Spree::UserMailer).to receive(:confirmation_instructions).and_raise("Some error")
       expect(Alert).to receive(:raise)
 
-      post :create, xhr: true, params: { spree_user: user_params, use_route: :spree }
+      post :create, params: { spree_user: user_params, use_route: :spree }, as: :json
 
       expect(response.status).to eq(401)
       json = JSON.parse(response.body)
@@ -41,7 +41,7 @@
     end
 
     it "returns 200 when registration succeeds" do
-      post :create, xhr: true, params: { spree_user: user_params, use_route: :spree }
+      post :create, params: { spree_user: user_params, use_route: :spree }, as: :json
       expect(response.status).to eq(200)
       json = JSON.parse(response.body)
       expect(json).to eq("email" => "[email protected]")
@@ -50,7 +50,7 @@
 
     it "sets user.locale from cookie on create" do
       cookies[:locale] = "pt"
-      post :create, xhr: true, params: { spree_user: user_params, use_route: :spree }
+      post :create, params: { spree_user: user_params, use_route: :spree }, as: :json
       expect(assigns[:user].locale).to eq("pt")
     end
   end